Search

Start Over Validation Level 2 Capability Type Simple Cone Search
801. 4.85 and 10.45GHz fluxes of SDSS-FIRST sources
ID:
ivo://CDS.VizieR/J/A+A/630/A83
Title:
4.85 and 10.45GHz fluxes of SDSS-FIRST sources
Short Name:
J/A+A/630/A83
Date:
21 Oct 2021
Publisher:
CDS
Description:
A detailed understanding of how the activity of a galactic nucleus regulates the growth of its host is still missing. To understand the activity and the types of accretion of supermassive black holes in different hosts, it is essential to study radio-optical properties of a large sample of extragalactic sources. In particular, we aim at studying the radio spectral index trends across the optical emission line diagnostic diagrams to search for potential (anti)correlations. To this goal, we combine flux densities from the radio FIRST survey at 1.4GHz (with the flux density range 10mJy<=F1.4<=1000mJy for 209 SDSS sources at intermediate redshift (0.04<=z<=0.4) with the Effelsberg radiotelescope measurements at 4.85GHz and 10.45GHz. The information about the optical emission-line ratios is obtained from the SDSS-DR7 catalogue. Using the Effelsberg data, we were able to infer the two-point radio spectral index distributions for star-forming galaxies, composite galaxies (with a combined contribution to the line emission from the star-formation and AGN activity), Seyferts, and low ionization narrow emission region (LINER) galaxies. While studying the distribution of steep, flat, and inverted sources across optical diagnostic diagrams, we found three distinct classes of radio emitters for our sample: (i) sources with steep radio index, high ionization ratio and high radio loudness, (ii) sources with flat radio index, lower ionization ratio and intermediate radio loudness, (iii) sources with inverted radio index, low ionization ratio and low radio loudness. The classes (i), (ii), (iii) cluster mainly along the transition from Seyfert to LINER sources in the BPT diagram. We interpret these groups as a result of the recurrent nuclear-jet activity.
802. 44 and 95GHz observations of class I methanol masers
ID:
ivo://CDS.VizieR/J/ApJS/248/18
Title:
44 and 95GHz observations of class I methanol masers
Short Name:
J/ApJS/248/18
Date:
21 Oct 2021
Publisher:
CDS
Description:
We report a simultaneous 44 and 95GHz class I methanol maser survey toward 144 sources from the 95GHz class I methanol maser catalog. The observations were made with the three telescopes of the Korean very long baseline interferometry network operating in single-dish mode. The detection rates are 89% at 44GHz and 77% at 95GHz. There are 106 new discoveries at 44GHz. Comparing the previous 95GHz detections with new observations of the same transitions made using the Purple Mountain Observatory 13.7m radio telescope shows no clear evidence of variability on a timescale of six years. Emission from the 44 and 95GHz transitions shows strong correlations in peak velocity, peak flux density, and integrated flux density, indicating that they are likely cospatial. We found that the peak flux density ratio S_pk,95_/S_pk,44_ decreases as the 44GHz peak flux density increases. We found that some class I methanol masers in our sample might be associated with infrared dark clouds, while others are associated with HII regions, indicating that some sources occur at an early stage of high-mass star formation, while others are located toward more evolved sources.
803. 3.5 and 1.3mm polarimetric survey of Northern AGNs
ID:
ivo://CDS.VizieR/J/A+A/566/A59
Title:
3.5 and 1.3mm polarimetric survey of Northern AGNs
Short Name:
J/A+A/566/A59
Date:
21 Oct 2021
Publisher:
CDS
Description:
Short millimeter observations of radio-loud active galactic nuclei (AGN) offer an excellent opportunity to study the physics of their synchrotron-emitting relativistic jets from where the bulk of radio and millimeter emission is radiated. On one hand, AGN jets and their emission cores are significantly less affected by Faraday rotation and depolarization than at longer wavelengths. On the other hand, the millimeter emission of AGN is dominated by the compact innermost regions in the jets, where the jet cannot be seen at longer wavelengths due to synchrotron opacity. We present the first simultaneous dual frequency 86GHz and 229GHz polarimetric survey of all four Stokes parameters for a large sample of 211 radio-loud active galactic nuclei, designed to be flux limited at 1Jy at 86GHz. Most of the observations were made in mid-August 2010 using the XPOL polarimeter on the IRAM 30m millimetric radio telescope.
804. Andromeda XIX member stars
ID:
ivo://CDS.VizieR/J/MNRAS/491/3496
Title:
Andromeda XIX member stars
Short Name:
J/MNRAS/491/3496
Date:
21 Oct 2021
Publisher:
CDS
Description:
With a central surface brightness of {mu}_0_=29.3mag/arcsec^2^, and half-light radius of r_half_=3.1^+0.9^_-1.1_kpc, Andromeda XIX (And XIX) is an extremely diffuse satellite of Andromeda. We present spectra for ~100 red giant branch stars in this galaxy, plus 16 stars in a nearby stellar stream. With this exquisite data set, we re-derive the properties of And XIX, measuring a systemic velocity of <v_r_>=-109.0+/-1.6km/s and a velocity dispersion of {sigma}_vr_=7.8^+1.7^_-1.5_km/s (higher than derived in our previous work). We marginally detect a velocity gradient along the major axis of dv/dX=-2.1+/-1.8km/s/kpc. We find its mass-to-light ratio is higher than galaxies of comparable stellar mass ([M/L]_half_=278^+146^_-198_M_{sun}_/L_{sun}_), but its dynamics place it in a halo with a similar total mass to these galaxies. This could suggest that And XIX is a 'puffed up' dwarf galaxy, whose properties have been altered by tidal processes, similar to its Milky Way counterpart, Antlia II. For the nearby stream, we measure v_r_=-279.2+/-3.7km/s, and {sigma}_rv_=13.8^+3.5^_-2.6_km/s. We measure its metallicity, and find it to be more metal rich than And XIX, implying that the two features are unrelated. Finally, And XIX's dynamical and structural properties imply it is a local analogue to ultradiffuse galaxies (UDGs). Its complex dynamics suggest that the masses of distant UDGs measured from velocity dispersions alone should be carefully interpreted.
805. 100 and 160um fluxes of nearby galaxies
ID:
ivo://CDS.VizieR/J/MNRAS/440/942
Title:
100 and 160um fluxes of nearby galaxies
Short Name:
J/MNRAS/440/942
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present Herschel/PACS 100 and 160{mu}m integrated photometry for the 323 galaxies in the Herschel Reference Survey (HRS), a K-band, volume-limited sample of galaxies in the local Universe. Once combined with the Herschel/SPIRE observations already available, these data make the HRS the largest representative sample of nearby galaxies with homogeneous coverage across the 100-500{mu}m wavelength range. In this paper, we take advantage of this unique data set to investigate the properties and shape of the far-infrared/submillimetre spectral energy distribution in nearby galaxies. We show that, in the stellar mass range covered by the HRS (8<~log(M*/M_{sun}_)<~12), the far-infrared/submillimetre colours are inconsistent with a single modified blackbody having the same dust emissivity index {beta} for all galaxies. In particular, either {beta} decreases or multiple temperature components are needed, when moving from metal-rich/gas-poor to metal-poor/gas-rich galaxies. We thus investigate how the dust temperature and mass obtained from a single modified blackbody depend on the assumptions made on {beta}. We show that, while the correlations between dust temperature, galaxy structure and star formation rate are strongly model dependent, the dust mass scaling relations are much more reliable, and variations of {beta} only change the strength of the observed trends.
806. A new catalog of 53522 4.85GHz sources
ID:
ivo://CDS.VizieR/VIII/13
Title:
A new catalog of 53522 4.85GHz sources
Short Name:
VIII/13
Date:
21 Oct 2021
Publisher:
CDS
Description:
of paper: A catalog of 53522 4.85GHz sources between 0 and 75 degrees declination has been generated from observations taken with the NRAO Green Blank 300foot (91m) telescope. The flux limit of the catalog is dependent on declination and ranges from about 40mJy at 0degree to 20mJy at 60degrees. The source positions given in the catalog have a 95% confidence radius of about 50arcsec. Spectral indices have been calculated for 29051 sources which have counterparts in the Texas 365MHz northern sky survey.
807. A new catalog of HII regions in M31
ID:
ivo://CDS.VizieR/J/AJ/142/139
Title:
A new catalog of HII regions in M31
Short Name:
J/AJ/142/139
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present a new catalog of HII regions in M31. The full disk of the galaxy (~24kpc from the galaxy center) is covered in a 2.2deg^2^ mosaic of 10 fields observed with the Mosaic Camera on the Mayall 4m telescope as part of the Local Group Galaxies survey.
808. A new 95GHz methanol maser catalog. I.
ID:
ivo://CDS.VizieR/J/ApJS/231/20
Title:
A new 95GHz methanol maser catalog. I.
Short Name:
J/ApJS/231/20
Date:
21 Oct 2021
Publisher:
CDS
Description:
The Purple Mountain Observatory 13.7m radio telescope has been used to search for 95GHz (8_0_-7_1_A^+^) class I methanol masers toward 1020 Bolocam Galactic Plane Survey (BGPS) sources, leading to 213 detections. We have compared the line width of the methanol and HCO^+^ thermal emission in all of the methanol detections, and on that basis, we find that 205 of the 213 detections are very likely to be masers. This corresponds to an overall detection rate of 95 GHz methanol masers toward our BGPS sample of 20%. Of the 205 detected masers, 144 (70%) are new discoveries. Combining our results with those of previous 95GHz methanol maser searches, a total of 481 95GHz methanol masers are now known. We have compiled a catalog listing the locations and properties of all known 95GHz methanol masers.
809. A new IR study of intrinsic and extrinsic S-type stars
ID:
ivo://CDS.VizieR/J/AJ/158/22
Title:
A new IR study of intrinsic and extrinsic S-type stars
Short Name:
J/AJ/158/22
Date:
21 Oct 2021
Publisher:
CDS
Description:
We collect all known intrinsic and extrinsic S-type stars to discuss their infrared properties and find their difference in the infrared using photometric data from the Two Micron All Sky Survey, Wide Field Infrared Survey Explorer, and Infrared Astronomical Satellite missions. Then we look for the diagnosis to extract intrinsic S-type stars from the large unclassified sample. We found that, statistically, intrinsic S-type stars have larger infrared excesses than extrinsic S-type stars in the wavelength region of 1-60 {mu}m due to thicker dusty circumstellar envelopes. We also found that only intrinsic S-type stars occupy the reddest color areas in all of the two-color diagrams we presented. Finally, 172 new intrinsic S-type stars are presented in this paper. This makes the number of known intrinsic S-type stars almost double. In addition, some intrinsic and extrinsic S-type stars have power-law distributions in some two-color diagrams with the wavelength longer than 5 {mu}m. The possible reason for this is also discussed.
810. A New Library of Optical Spectra
ID:
ivo://CDS.VizieR/III/166
Title:
A New Library of Optical Spectra
Short Name:
III/166
Date:
21 Oct 2021
Publisher:
CDS
Description:
Silva and Cornell have compiled a new digital optical stellar spectra library, consisting of intensities at 5A intervals between 3510A and 8930A for 72 different spectral types. These types range from O to M and luminosities range from I to V. Some weak-line and strong-line spectra are also included. The intensities are in ergs/A, normalized to 100 at 5450A.

Limit your search

more »

more »

more »

more »

more »

more »